000131683 001__ 131683
000131683 005__ 20240219150720.0
000131683 0247_ $$2doi$$a10.1111/j.1365-246X.2012.05620.x
000131683 0248_ $$2sideral$$a90020
000131683 037__ $$aART-2012-90020
000131683 041__ $$aeng
000131683 100__ $$aKind, Jessica
000131683 245__ $$aRock magnetic techniques complemented by ferromagnetic resonance spectroscopy to analise a sediment record
000131683 260__ $$c2012
000131683 5203_ $$aEnvironmental magnetism uses the spatial and temporal occurrence of magnetic carriers as diagnostic tools to detect environmental changes. Concentration, composition, grain size and configuration of the carriers inferred from magnetic properties are key parameters, because they are indicative of the formation conditions of magnetic phases, and/or of processes such as diagenesis and weathering. We present a detailed ferromagnetic resonance (FMR) spectroscopy analysis in concert with routinely used rock magnetic measurements to determine these parameters in a sediment record that documents the development of Lake Soppensee (Central Switzerland) since latest Pleistocene. FMR spectroscopy monitors varying concentration of the predominant magnetite/maghemite by the spectral signal intensity, whereas the stable single domain and superparamagnetic states are determined by the signal shape at room and low temperature. Fitting and simulation of FMR spectra are successfully applied to samples with well-defined magnetite components in the sediment matrix. Clear evidence for the colonization of magnetotactic bacteria (MTB) in Lake Soppensee was possible by applying empirical spectral separation to measured FMR signals that yield two magnetite populations differing in their configuration, that is, dispersed and aligned in chains. Low temperature measurements showed that these MTB can be preserved as pure or oxidized magnetite. The FMR data set confirms and completes rock magnetic information obtained from the lacustrine sedimentary record. The advanced application of FMR spectroscopy in the presented study critically highlights the benefit of this rapid and non-destructive method for future analysis of magnetic properties in environmental studies.
000131683 540__ $$9info:eu-repo/semantics/openAccess$$aAll rights reserved$$uhttp://www.europeana.eu/rights/rr-f/
000131683 590__ $$a2.853$$b2012
000131683 591__ $$aGEOCHEMISTRY & GEOPHYSICS$$b17 / 76 = 0.224$$c2012$$dQ1$$eT1
000131683 655_4 $$ainfo:eu-repo/semantics/article$$vinfo:eu-repo/semantics/publishedVersion
000131683 700__ $$avan Randen, Ulrike
000131683 700__ $$0(orcid)0000-0002-1827-1250$$aGarcía-Rubio, Inés
000131683 700__ $$aGehring, Andreas
000131683 773__ $$g191, 1 (2012), 51-63$$pGeophys. j. int.$$tGEOPHYSICAL JOURNAL INTERNATIONAL$$x0956-540X
000131683 8564_ $$s3729836$$uhttps://zaguan.unizar.es/record/131683/files/texto_completo.pdf$$yVersión publicada
000131683 8564_ $$s2869478$$uhttps://zaguan.unizar.es/record/131683/files/texto_completo.jpg?subformat=icon$$xicon$$yVersión publicada
000131683 909CO $$ooai:zaguan.unizar.es:131683$$particulos$$pdriver
000131683 951__ $$a2024-02-19-13:23:31
000131683 980__ $$aARTICLE